机构地区:[1]浙江中医药大学第一临床医学院浙江中医药大学附属第一医院消化内科,杭州310006 [2]浙江中医药大学第一临床医学院浙江中医药大学附属第一医院病理科,杭州310006 [3]浙江中医药大学第一临床医学院浙江中医药大学附属第一医院中心实验室,杭州310006 [4]浙江中医药大学第一临床医学院浙江中医药大学附属第一医院动物实验中心,杭州310006
出 处:《中华医学杂志》2016年第18期1444-1449,共6页National Medical Journal of China
基 金:国家自然科学基金(81273903)
摘 要:目的观察雷公藤多苷(TWP)对溃疡性结肠炎(UC)的作用,以及对Toll样受体4(TLR4)/髓样分化因子88(MyD88)信号通路的干预作用,以探讨其可能的作用机制。方法采用三硝基苯磺酸(TNBS)/乙醇灌肠法建立UC大鼠模型。采用随机数字表法将90只雄性Wistar大鼠随机分为正常对照组、模型对照组及TWP低、中、高剂量(3、6、12mg/kg)组、硫唑嘌呤(AZA)组(6mg/kg),每组15只。造模后第4天,各组分别给予相应药物连续灌胃14d。观察各组大鼠疾病活动指数(DAI)、结肠大体形态损伤以及组织学评分,采用反转录(RT)-PCR法和Western印迹法检测各组大鼠肠道组织中TLR4/MyD88信号通路相关蛋白——TLR4、MyD88、肿瘤坏死因子受体相关因子6(TRAF-6)、核因子κB(NF—κB)、肿瘤坏死因子α(TNF-α)、白细胞介素1β(IL-1β)的表达。结果模型对照组大鼠DAI、结肠大体形态损伤及组织学评分均显著高于正常对照组(均P〈0.01),大鼠造模成功;TwP高剂量组的DAI评分、结肠大体形态损伤评分及组织学评分均低于模型对照组[(0.87±0.25)比(1.60±0.76)分,(3.93±1.94)比(5.40±2.21)分,(5.45±2.73)比(13.27±3.50)分,均P〈0.05]。模型对照组大鼠TLR4、MyD88、TRAF-6、NF—κB、TNF-α、IL-1βmRNA及蛋白表达明显高于正常对照组(均P〈0.01);TWP高剂量组上述指标mRNA及蛋白表达均明显低于模型对照组(mRNA:2.166±0.475比5.647±0.275、1.295±0.087比3.774±0.418、1.125±0.188比2.535±0.320、1.201±0.152比2.082±0.077、1.525±0.218比3.094±0.022、1.797±0.257比17.152±0.145;蛋白:0.252±0.010比0.277±0.008、0.172±0.002比0.213±0.005、0.233±0.006比0.248±0.003、0.099±0.003比0.122±0.007、0.238±0.002比0.252±0.005、0.235±0.003比0�Objective To observe the effect of Tripterygium wilfordii polycoride (TWP) on ulcerative colitis (UC), and its intervention effect on toll-like receptor 4 (TLR4)/myeloid differentiation factor 88 (MyD88) signaling pathway, thus to investigate its possible mechanism. Methods Trinitrobeuzene sulfouie acid (TNBS)/ethanol enema method was used to set up the UC rat model. With random number table, 90 male Wistar rats were divided into normal control group, model group, TWP low, medium and high dose group (3, 6, 12 mg/kg, respectively) and azathioprine (AZA) group (6 mg/kg), with 15 rates in each group. Four days after enema, rates in each group were given corresponding drug lavage for 14 consecutive days. Disease activity index (DAI), colon gross morphological damage and histological grading of each group were observed. Using Western blot and reverse transcription ( RT)-PCR method, the TLR4/MyD88 signaling pathway-related proteins in UC rat intestinal tissue were detected, namely TLR4, MyD88, tumor necrosis factor receptor related factor 6 ( TRAF-6), nuclear factor kappa B ( NF-KB), tumor necrosis factor alpha ( TNF-α), and interleukin-1 beta (IL-1β). Results The DAI, colon gross morphological damage, and histological grading of the model group were significantly higher than that of the normal control group ( all P 〈0. 01 ), indicating successful establishment of UC model. The DAI, colon gross morphological damage and histological grading of the TWP high dose group were lower than those of the model group (0. 87 ± 0. 25 vs 1.60 ± 0.76, 3.93 ± 1.94 vs 5.40 ± 2. 21, 5.45 ± 2. 73 vs 13.27 ± 3.50, P 〈 0. 05). Compared with the normal control group, the mRNA and protein expressions of TLR4, MyD88, TRAF-6, NF-κB, TNF-α, and IL-1β in the model group rats were significantly increased (all P 〈 0. 01 ); which were significantly decreased in the TWP high dose group compared with model group rats ( mRNA :2. 166 ± 0. 475 vs 5. 647 ± 0. 275,
关 键 词:雷公藤属 结肠炎 溃疡性 Toll样受体4/髓样分化因子88信号通路
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